Phonons in slow motion: Dispersion relations in ultrathin Si membranes

John Cuffe; Emigdio Chávez; Andrey Shchepetov; Pierre-Olivier Chapuis; El Houssaine El Boudouti; Francesc Alzina; Timothy Kehoe; Jordi Gomis-Bresco; Damian Dudek; Yan Pennec; Bahram Djafari-Rouhani; Mika Prunnila; Jouni Ahopelto; Clivia M. Sotomayor Torres

doi:10.1021/nl301204u

Phonons in slow motion: Dispersion relations in ultrathin Si membranes

John Cuffe, Emigdio Chávez, Andrey Shchepetov, Pierre-Olivier Chapuis, El Houssaine El Boudouti, Francesc Alzina, Timothy Kehoe, Jordi Gomis-Bresco, Damian Dudek, Yan Pennec, Bahram Djafari-Rouhani, Mika Prunnila, Jouni Ahopelto, Clivia M. Sotomayor Torres (Corresponding Author)

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Abstract

We report the changes in dispersion relations of hypersonic acoustic phonons in free-standing silicon membranes as thin as ∼8 nm. We observe a reduction of the phase and group velocities of the fundamental flexural mode by more than 1 order of magnitude compared to bulk values. The modification of the dispersion relation in nanostructures has important consequences for noise control in nano- and microelectromechanical systems (MEMS/NEMS) as well as opto-mechanical devices.

Original language	English
Pages (from-to)	3569-3573
Journal	Nano Letters
Volume	12
Issue number	7
DOIs	https://doi.org/10.1021/nl301204u
Publication status	Published - 2012
MoE publication type	A1 Journal article-refereed

Funding

Keywords

Confined phonons
dispersion relations
inelastic light scattering
Si membranes
slow phonons
ultrathin

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https://hal.science/hal-00732480/

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title = "Phonons in slow motion: Dispersion relations in ultrathin Si membranes",

abstract = "We report the changes in dispersion relations of hypersonic acoustic phonons in free-standing silicon membranes as thin as ∼8 nm. We observe a reduction of the phase and group velocities of the fundamental flexural mode by more than 1 order of magnitude compared to bulk values. The modification of the dispersion relation in nanostructures has important consequences for noise control in nano- and microelectromechanical systems (MEMS/NEMS) as well as opto-mechanical devices.",

keywords = "Confined phonons, dispersion relations, inelastic light scattering, Si membranes, slow phonons, ultrathin",

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year = "2012",

doi = "10.1021/nl301204u",

language = "English",

volume = "12",

pages = "3569--3573",

journal = "Nano Letters",

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publisher = "American Chemical Society ACS",

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TY - JOUR

T1 - Phonons in slow motion

T2 - Dispersion relations in ultrathin Si membranes

AU - Cuffe, John

AU - Chávez, Emigdio

AU - Shchepetov, Andrey

AU - Chapuis, Pierre-Olivier

AU - El Boudouti, El Houssaine

AU - Alzina, Francesc

AU - Kehoe, Timothy

AU - Gomis-Bresco, Jordi

AU - Dudek, Damian

AU - Pennec, Yan

AU - Djafari-Rouhani, Bahram

AU - Prunnila, Mika

AU - Ahopelto, Jouni

AU - Sotomayor Torres, Clivia M.

PY - 2012

Y1 - 2012

N2 - We report the changes in dispersion relations of hypersonic acoustic phonons in free-standing silicon membranes as thin as ∼8 nm. We observe a reduction of the phase and group velocities of the fundamental flexural mode by more than 1 order of magnitude compared to bulk values. The modification of the dispersion relation in nanostructures has important consequences for noise control in nano- and microelectromechanical systems (MEMS/NEMS) as well as opto-mechanical devices.

AB - We report the changes in dispersion relations of hypersonic acoustic phonons in free-standing silicon membranes as thin as ∼8 nm. We observe a reduction of the phase and group velocities of the fundamental flexural mode by more than 1 order of magnitude compared to bulk values. The modification of the dispersion relation in nanostructures has important consequences for noise control in nano- and microelectromechanical systems (MEMS/NEMS) as well as opto-mechanical devices.

KW - Confined phonons

KW - dispersion relations

KW - inelastic light scattering

KW - Si membranes

KW - slow phonons

KW - ultrathin

U2 - 10.1021/nl301204u

DO - 10.1021/nl301204u

M3 - Article

SN - 1530-6984

VL - 12

SP - 3569

EP - 3573

JO - Nano Letters

JF - Nano Letters

IS - 7

ER -

Phonons in slow motion: Dispersion relations in ultrathin Si membranes

Abstract

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Keywords

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